hamilton



H. M. HAMILTON. DIE FOR FORMING THE EYES 0F PICKS.

Patented Aug. 27, 1867.

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HENRY M. HAMILTON, OF NEW YORK, N. Yr

Lattcrs'latcnt NoffiSJB'iQdatcd August 27, 1867.

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TO ALL WHOM IT'MAY coNennN= Be it known that I, H. M. HAMILTON, of the city, county, and State of New York, have invented a new and improved Die and Punch for Forming Elongated Eyes of Tools and I do hereby decla're the following to bc a. full, clear, and exact descriptionoftlie same, sufficient toenable one skilled in the artt ivfhich the invention appertains to make use ofit, reference being had-to the accompanying-drawings, which-fol part of this specification, and in which---- Figure 1 is a perspective view with a portion of the dieremoved. Figure 2 is a-transv'ersc section. Figures 3 and 4 are diagram sections illustrating the-operation.

The die is formed of two parts, the opening therein corresponding to the required external conformation of the head of the tool. The blank of hot metal placed in thedie does not'fully occupy'-the' cavity. but the punch which forms the eye thrusts the" metal forward, and makes the'raised or elongated eye.

I The rim around the elongated end'of the eye is formed by a chilled iron or steel fi'angeor annular cutter in the die, the projection of the cutter from the face of 'the .die correspondingto-th'e thickness of the eye at its elongated end. i l

The punch hits an entering-edge to cleave its way throhgh-the metal, and a shoulder, which corresponds to the opening in the cutter. The shaft of the punch corresponds to the shapc'of the-eye. The punch pushes the metal laterally and forwarih and the should-er, shearing against the cutter, removes superfluous metal.

The bulb or enlarged portion of the metal blank, when placed in die, fully occupiesthe upper P0111011 (as represented) of the die,l.bcing-ti ghtly clasped between thedies, and also between the rounded shoulder and upper flange, so that the punch on entering does not mar the shape by bending thevblank or causing it to sag away from the upper surfaces; but, the blank being firmly held, the punch enters, and its conical portion exerts a lateralpressure' upon the metal, while the latter is also pushed before and prolonged 'intoan eye, which fills up the lower portion of the cavity of. the dic..

' Inthe drawings, A A are the two halves of the dic,'thc, cavity between them corresponding to the shape of a pick-head. I These portions may be clasped together after the blank B is introduced bymeans of jaws G C, (fig. 2,) or in any other .suflicient manner. At the upper part of -the die is an opening, 1), into which the punch E is introduced, the cutting-face) cleaving its nay through the red-hot metal of the blank B, forcing it laterally andl downward, causing it to occupy the whole cavity. If the' metel be fsorn'ewhat'iu eircess it will be forced forward'through the cutter Gr, as'seen infig. 3; and, thc punchcontinuing to' descend, the shoulder, 2 outs it ofi' against the cutter (has seen in fig. 4, and the face or edge of the elongetedcye receives its shape and finish from the inner face of the cavity of the die A A. v

When the lnctalis in .exact quantity, as in fig. 2, it just fills the cavity. The punch is withdrawn after the eye is formedpthe flanges d d pressing upon the" upper side, keeping the blank downduring this port of the operation. i a

It is not absolutely necessary that the upper surface'shal'l .be'entirely enclosed, but-mcr'epr'ojections may i be sufiicient to hold the pick down as the punch is withdrawn.

The blanks for this purpose may be made in a rolling-mill by forming a continuous bar of some length,

with occasional swells or enlargements upon it, the lengths, when detached, possessing the requiredqudntit'y' of metal for the purpose, and in the right'shape, for it isdesirabl'e, in the first place, that the metal shall be suflicient, when expanded by the punch, to fill the cavity and. complete the elongation of the eye; and also that it shall be of such a size, when clasped by the'cheeks of the dicfthat the entering punch shall pierce the middle, and notbend or displace it, encept us it pushes the metal out below for the raised eye.

It will be manifest that it the bulb of the blank does not fully reach the SldQS,lli may luck on one side only. The punch will then not strike the'centre, and a failure will be the result. -j In practice it has also been found thatn'hen the bulb does not fillthe dieat the portions marked a a a, andthein counterparts,

the descendingpunch tends to bow inthe upperV-surfaoe,.instead of cutting in and through, that is,,pu shes the blank out of shape at the place andtime "of contact, instead o'fcleeving through it,. spreading the metal out. wardly against all parts of. the adja'ce nt' walls'of the (lie,and prolonging the wave ofiiron it pushes beforeit into'an elongation, the penetration of which by the punch forms it into an eye.

.For the convenience of description l ha ve called certain portions the upper side or lower side, respectively, intending to indicate it as shown in the drawing. I do not intend ,to indicate that any special position of the dies is necessary which would bring any particular side or portion uppermost. The die may be moved up or down to the punch, or, conversely, the punch maybe moved to the die.

I have spoken of the possible substitution of projections on'the upper side of the die in place of absolutely enclosing the blank on that side, as shown in the drawing, excepting at the punch-hole. I do not consider that the said substitution of the projecting points for an enclosing side will be so eilic'ient or produce so good an effect as the perfect enclosure of the blank on the upper side. i In the latter'case the soft metal, being pressed by the entering punch, is forced against and conformed to the sides of the die, whereas it might protrude from the desired line of conformation between mere projection s, and form knobs or swells, which would require removal subsequently. v

I may elect to make the eye in the pick by the introduction of the punch from the other end of the eye; and, in'that case, the blank will be made to fit the elongated portion, and the entering punch will, in its progress, force the metal towards what is shown in-thc drawing as the upper s'id'e.- I'-do not prefer this mode, as the blank is more diilicult of preparation, and is more likely to be pinched in the closing dies; but, should this mode of operation be adopted, the upper side of the die will become a necessity, as the'soft metal is forced .by the entering punch towards that side; and the perfect enclosure of the blank, except at the punch-hole, will give the desired conformation, the edge of the punch-hole acting as the cutter, in the course of operation, to cut oil and remove the superfluous metal. I I

Having described my invention, what I claim therein as new, and desire to secure by Lctte1's'Patcn t,is- I claim the combination of the improved jaws A A, a divided cutter ring, G, (either at the upper or lower side,) and a shouldered punch, E, operating substantially as described.

' To the above specification of my improvement I have signed my hand this 14th of January, 1867..

H. M. HAMILTON,

Witnesses: v SoLoN C. KEMon, GEO. W. ROTHWELL. 

